<!DOCTYPE html>
<html>
    <head>
        <title>document</title>
        <script src="js/vue.js"></script>
    
    </head>
    <body>
        <div id="app">
            {{msg}}
            <input type="text" v-model.lazy="msg">
        </div>
        <script>
            var vm = new Vue({
                el: '#app',
                data: {
                    msg: 'helloworld'
                }
            })
        </script>
    </body>
</html>